A few questions on improving the attached figure

Hi,
   For the attached figure, how to change the color of shading to grey? In
my code, I used
  mapa_at_cnMonoFillColor = True
  mapa_at_cnFillColor = "Grey"
   But the output color is in light blue.
  A second question is how to move "CONTOUR FROM -3 TO 3 BY .2" down below
the longitude. In the figure, it partially covers 90W.
  Please provide help if you have some suggestions. Thank you very much in
advance.
  Lei

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